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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./OL_SDK/include-openlayers-local.js"></script>
    <script src="./libs/gaode.js"></script>
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<body>
    <div id="map">
    </div>
<script>
    var map = new ol.Map({
        target:"map",
        layers:[gaode],
        view:new ol.View({
            projection:'EPSG:4326',
            center:[114.30,30.50],
            zoom:4
        })
    })
    /* 创建画布 - 空的图层 */
    const source = new ol.source.Vector({

    })
    const layer = new ol.layer.Vector({
        source
    })
    map.addLayer(layer);
    /* 创建画笔 */
    let draw = new ol.interaction.Draw({
        type:"Circle",
        source
    })
    /* 激活画笔  */
    map.addInteraction(draw);
</script>
</body>
</html>